Frank Lampard is determined to make a decisive impact in tomorrow's return to Upton Park - but only to ensure Chelsea reach the Champions League and not to send West Ham down.

Lampard's fond memories of his time at West Ham have been rather diluted since his departure by the animosity shown to him by many Hammers' fans.

He has not exactly helped this by his declarations he has "now fallen in love with Chelsea" after moving to a "big club."

But the midfielder insists he bears no animosity towards the club which nurtured him through his development, even if they sacked his father, Frank senior.

The game at Upton Park is nevertheless an enormous test for both clubs, with Chelsea chasing a Champions League spot and West Ham desperately trying to retain their Premiership status.

Defeat for the Hammers would almost inevitably spell relegation, while Chelsea need a victory to leave them requiring just a point in their final game at home to Liverpool to make sure of fourth place.

Lampard said: "If we beat Liverpool then we're in the Champions League but let's beat West Ham first and make sure.

"I want to go back there and do something good but we want to win the game above all else.

"If we do win, that gives us the opportunity to play Liverpool needing a draw to finish in the top four."